The Siegel Chapel is named after Lincoln Lake's long-time friends: Albert & Helen Siegel. "Grandpa & Grandma Siegel" were instrumental in the history of the camp, serving the camp as Superintendent, along with other roles for over 40 years. The Siegel chapel was completed in 1972 and still remains the epicenter for the teaching of the Word of God at Lincoln Lake.

The upper level of the chapel holds the Auditorium, which regularly seats 160 guests, with capacity for 190.  The chapel is equipped with full A/V equipment and wi-fi for teaching purposes.

The lower level contains three lodging rooms with eight beds in each room and a "Flex room", which can be used for seminar space, lounge space, or counseling.